Boiler



O. T..NELSON A yBomen Filed Nov. 19-I March 30 1926.

Patentes] Mar. 30, 1926.

v{Hariri-7.of STefIESk OLLYIE T. NELSON, ,0F WAUKEGAN`, 1LLIN0IS.

BOILER.

Application area November 19, le20. seriaiN. 425,976.

To uZZ fuliom it may' oog-wem.'

Be itknown that I, @man T'. NELSON, a citizen of the United States, anda resident, lor Waukegan, in the county of Lake and,

Water-legs in double Wall structures and to space the inner and outerAWalls apart by rivets or similar devices. One object of they inventionis to provide an improved double;

Wall structure in which theuse is avoided ofl rivets and like spacingdevices.

Another object of the inventionis to provide an improved methody ofconstructing double-Wall structures for boilers.

The invention consists in the several novel features hereinafter set.forth and more particularly defined by claims at the conclusion hereof.y

In the drawings.: Fig. 1 is a side elevation of a boiler embodyingtheinvention, a portion being broken away and shown in section. Fig. 2fis ahorizontal section through the supporting structure taken online 2-2 ofFig. 1. Fig. 3 is a detail perspective of a portion of said structure.Fig. 4L is a vertical section on line 4 4 of Fig. 2. Fig. 5 is a sectiontaken on line 5 5 of Fig; l.

The'invention is illustrated as applied to a heater `comprising ahorizontal boiler 7 containing smoke fines connected to a smoke outlet 8and a Water chamber of usual construction and as Well understood in theart.y The boiler 7 rests upon a structure which forms a support thereforand, in effect/,water legs around the fire-box and below the boiler.

Thislstructure may rest upon any suitable bed and contains' the usualbridge-Wall and Y grate, as well understood in the art. This supportingstructure is built up of a plate 9 which is shaped to form a continuousouter Wall 10, a bottom 11, the lower portion 12' lof the inner Wall,the top 13 and the upper portion 14 of the inner Wall ofthe structure,

all integral, with a gap between the inner- Wallportions 12 and 14. Thisgap is closed by a series of plates Which are secured together tocomplete the inner Wall between said upper and lower portions and areflanged outwardly and Secured to .the outer wall p l Y, f. PATENTomgatoprovide spacing'fmeans and passages between the inner and outer Walls.`manufacture of these structures, the outer plateivithlbottoin 11,1top'13 and upper and. lower inner Walls `12and `14' isiirst formed.

Next, a plate .15 with marginal out-turned In the n flanges 1G issecuredk to the outer ivall by,

vWelding the edges of both of the flanges to the outer Wall. This plate15 providessuu faces to which. contiguous angular plates 17 maybesecured.

Plates 17, each com# prisingjanportion 17 adapted to form a porp tion ofthe inner Wall anda flange18 extend-v ing to the outer Wall,y arevsecured to the sides of plate 15 and to the outer Wall by Welding allcontiguous surfaces together. AdditionalV plates 17 are`theirseriallysecured to one another and to the plate tJguntil theentireinner wall has been completed,v with the usual openings `therein Wheredesired. Usually, a plate 15 is secured to each side of the y. vstructure and plates 17 are added until `thc-y structure has beencompleted. The upper' and lower meeting edges ofthe plates 15,

17 andportions 12 and 14C-of plate 9 are bev-' f elled and Welded tooneanother as at 20. The

edges of the flanges of plates 15 and 17 arebevelled and Welded to theWall 10, as shown at 21.

When the double Walls are formed in this manner, the angular flanges ofthe plates,

Which'are `Welded to the inner face of the t outer' Wall,`serve asspacing andV securing means between `the inner and outer Walls whichrender the structure eficient in Witlistandingthe stresses yto Whichlthey vare subjected in practiceand also dividel the space into verticalWater-passages. f

The invention exemplifies a boiler. Wall which is formed of platesWelded togetherA and 'in Wliichflanges serve to Space and se-y cure theinner and outer 1Walls together.

The invention also exemplifies a method of making double Walled -orplate boilers in which rivets and the like arerdispensed With.

lThe invention is not ytobe understoodas 'restricted to the details setforth since these may be modified Within `the scope ofthe appendedclaims Without departing vfrom the spirit and scope of the invention. f'e Having thus described the invention, what :[.claim as nevv and desireto secure by Letters Patent, is: l

1. A double Walled boiler structure cornprising a continuous, plateforming vone of the wallefdllfl @Xille to form a portion of -tl1e otherWall, and a Series oalngular plates secured to Vcherextencled portion oftheszi/id portonsvol' Vthe other well74 and a series'o Vplates; Securedto one anotherk mdto lche c011- tmuous plate and extenclmg" between sindY continuous plate.

upper and lower portions yto complete solid` other Wall mld: la-vgfangessecured to the Walls and extended to form uppe and' lower poti'ons oftheothe'f Wall, und e seree of y plates Welcledy to oneranother and tothe continuol'lsY plate and' kextendmg between 'seul o; A; doublewvallboilerv structure. compris-r 111g.aae'ohtmuousplte formmg one o'l theuppel'rancl lower pol-tions andrhavng-,flanges v A Welded to the inne-r.face of the continuous plate.

"OLLIVE T.' lnsLsoN.y

